Paper Info
Title
Time-frequency packing for linear modulations: spectral efficiency and practical detection schemes
Abstract
We investigate the spectral efficiency, achievable by a low-complexity symbol-by-symbol receiver, when linear modulations based on the superposition of uniformly time- and frequency-shifted replicas of a base pulse are employed. Although orthogonal signaling with Gaussian inputs achieves capacity on the additive white Gaussian noise channel, we show that, when finite-order constellations are employed, by giving up the orthogonality condition (thus accepting interference among adjacent signals) we can considerably improve the performance, even when a symbol-by-symbol receiver is used. We also optimize the spacing between adjacent signals to maximize the achievable spectral efficiency. Moreover, we propose a more involved transmission scheme, consisting of the superposition of two independent signals with suitable power allocation and a two-stage receiver, showing that it allows a further increase of the spectral efficiency. Finally, we show that a more involved equalization algorithm, based on soft interference cancellation, allows to achieve an excellent bit-error-rate performance, even when error-correcting codes designed for the Gaussian-noise-limited channel are employed, and thus does not require a complete redesign of the coding scheme.
Year
DOI
Venue
2009
10.1109/TCOMM.2009.10.080200
IEEE Transactions on Communications
Keywords
Field
DocType
coding scheme,gaussian-noise-limited channel,two-stage receiver,practical detection scheme,achievable spectral efficiency,gaussian input,symbol-by-symbol receiver,spectral efficiency,time-frequency packing,low-complexity symbol-by-symbol receiver,adjacent signal,linear modulation,additive white gaussian noise,phase shift keying,bit error rate,constellation diagram,information theory,interference,ofdm,time frequency,time frequency analysis,signal to noise ratio,phase noise,pulse modulation,gaussian noise,awgn,modulation,information rate,adjacent channel interference,communication system,error correction code
Computer science,Signal-to-noise ratio,Single antenna interference cancellation,Adjacent-channel interference,Electronic engineering,Spectral efficiency,Interference (wave propagation),Gaussian noise,Phase-shift keying,Bit error rate
Journal
Volume
Issue
ISSN
57
10
0090-6778
Citations 
PageRank 
References 
49
2.55
16
Authors
3
Name
Order
Citations
PageRank
Alan Barbieri131719.73
Dario Fertonani227320.07
Giulio Colavolpe380168.60